Old Jug with birds of paradise design

Such a beautiful  unusual jug for a collection.  There is no makers backstamp.  Underglaze impression 100 and 5  Gilt no 41.  The jug is in used vintage/antique condition.  There is a hairline crack on the lip of the jug which extends about 6 cms down the jug.   I enjoy this jug so much that its in my little collection until it finds a new home!!  There is some loss of colour on some areas.   See the pictures.   Dont hesitate to ask any questions.